EP2314321B1 - Formulations comprising antisense nucleotides to connexins - Google Patents

Formulations comprising antisense nucleotides to connexins Download PDF

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EP2314321B1
EP2314321B1 EP10013180.4A EP10013180A EP2314321B1 EP 2314321 B1 EP2314321 B1 EP 2314321B1 EP 10013180 A EP10013180 A EP 10013180A EP 2314321 B1 EP2314321 B1 EP 2314321B1
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formulation
connexin
use according
gel
antisense
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EP2314321A1 (en
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David Laurence Becker
Colin Richard Green
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CoDa Therapeutics Inc
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CoDa Therapeutics Inc
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    • C07H21/00—Compounds containing two or more mononucleotide units having separate phosphate or polyphosphate groups linked by saccharide radicals of nucleoside groups, e.g. nucleic acids
    • C07H21/04—Compounds containing two or more mononucleotide units having separate phosphate or polyphosphate groups linked by saccharide radicals of nucleoside groups, e.g. nucleic acids with deoxyribosyl as saccharide radical
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/70—Carbohydrates; Sugars; Derivatives thereof
    • A61K31/7088—Compounds having three or more nucleosides or nucleotides
    • A61K31/711—Natural deoxyribonucleic acids, i.e. containing only 2'-deoxyriboses attached to adenine, guanine, cytosine or thymine and having 3'-5' phosphodiester links
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P17/00—Drugs for dermatological disorders
    • A61P17/02—Drugs for dermatological disorders for treating wounds, ulcers, burns, scars, keloids, or the like
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P17/00—Drugs for dermatological disorders
    • A61P17/12—Keratolytics, e.g. wart or anti-corn preparations
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    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P17/00—Drugs for dermatological disorders
    • A61P17/16—Emollients or protectives, e.g. against radiation
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P25/00—Drugs for disorders of the nervous system
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P29/00—Non-central analgesic, antipyretic or antiinflammatory agents, e.g. antirheumatic agents; Non-steroidal antiinflammatory drugs [NSAID]
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P43/00—Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00
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    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
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    • C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
    • C12N15/09—Recombinant DNA-technology
    • C12N15/11—DNA or RNA fragments; Modified forms thereof; Non-coding nucleic acids having a biological activity
    • C12N15/111—General methods applicable to biologically active non-coding nucleic acids
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    • C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
    • C12N15/09—Recombinant DNA-technology
    • C12N15/11—DNA or RNA fragments; Modified forms thereof; Non-coding nucleic acids having a biological activity
    • C12N15/113—Non-coding nucleic acids modulating the expression of genes, e.g. antisense oligonucleotides; Antisense DNA or RNA; Triplex- forming oligonucleotides; Catalytic nucleic acids, e.g. ribozymes; Nucleic acids used in co-suppression or gene silencing
    • C12N15/1138—Non-coding nucleic acids modulating the expression of genes, e.g. antisense oligonucleotides; Antisense DNA or RNA; Triplex- forming oligonucleotides; Catalytic nucleic acids, e.g. ribozymes; Nucleic acids used in co-suppression or gene silencing against receptors or cell surface proteins
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K38/00—Medicinal preparations containing peptides
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    • C12N2310/00—Structure or type of the nucleic acid
    • C12N2310/10—Type of nucleic acid
    • C12N2310/11—Antisense
    • C—CHEMISTRY; METALLURGY
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    • C12N2320/00—Applications; Uses
    • C12N2320/30—Special therapeutic applications
    • C12N2320/32—Special delivery means, e.g. tissue-specific

Definitions

  • This invention relates to formulations for use in therapeutic treatments, particularly those in which a localised disruption in direct cell-cell communication is desirable.
  • Gap junctions are cell membrane structures which facilitate direct cell-cell communication.
  • a gap junction channel is formed of two hemichannels (connexons), each composed of six connexin subunits. These connexins are a family of proteins, commonly named according to their molecular weight or classified on a phylogenetic basis ie. into an ⁇ class and ⁇ ⁇ class.
  • ODNs Anti-sense oligodeoxynucleotides
  • the invention provides a formulation for use in the treatment of a human by therapy, which formulation comprises an antisense polynucleotide to connexin 43 together with a pharmaceutically acceptable carrier or vehicle.
  • the formulation contains polynucleotides to one connexin protein only.
  • oligodeoxynucleotides Many aspects of the invention are described with reference to oligodeoxynucleotides. However it is understood that other suitable polynucleotides (such as RNA polynucleotides) may be used in these aspects.
  • the formulation contains oligodeoxynucleotides to more than one connexin protein,provided that one of the connexin proteins to which oligodeoxynucleotides are directed is connexin 43.
  • Other connexin proteins to which oligodeoxynucleotides are directed include connexin 26, connexin 31.1 and connexin 32.
  • oligodeoxynucleotide to connexin 43 is selected from:
  • oligodeoxynucleotide to connexin 43 is:
  • oligodeoxynucleotide to connexin 26 is:
  • oligodeoxynucleotide to connexin 31.1 is:
  • oligodeoxynucleotide to connexin 32 is:
  • the polynucleotide in the formulation may be: (i) DNA or RNA; (ii) an oligodeoxynucleotide; (iii) an unmodified phosphodiester oligonucleotide; (iv) a chemically modified phosphodiester oligonucleotide; (v) a chemically modified oligonucleotide selected from phosphorothioates, methylphosphonates, phosphoramidates, phosphorodithioates, N3'P5'-phosphoramidates, oligoribonucleotide phosphorothioates and their 2'-O- alkyl analogs, 2'-O-methylribonucleotide methylphosphonates, and mixed backbone oligonucleotides; (vi) between 6 and 40 nucleotides in length, such as between 12 and 20 nucleotides in length; (vii) single stranded; or (viii) double stranded.
  • the polynucleotide is an unmodified phosphodiester oligomer of 30 nucleotides in length.
  • the anti-sense polynucleotides may be formulated for parenteral, intramuscular, intracerebral, intravenous, subcutaneous or transdermal administration.
  • the antisense polynucleotides are preferably administered topically (at the site to be treated).
  • the antisense polynucleotides are combined with a pharmaceutically acceptable carrier, vehicle or diluent to provide a pharmaceutical composition.
  • Suitable pharmaceutically acceptable carriers or vehicles include any of those commonly used for topical administration.
  • the topical formulation may be in the form of a cream, ointment, gel, emulsion, lotion or paint.
  • the formulation of the invention may also be presented in the form of an impregnated dressing.
  • Suitable carrier materials include any carrier or vehicle commonly used as a base for creams, lotions, gels, emulsions, lotions or paints for topical administration.
  • examples include emulsifying agents, inert carriers including hydrocarbon bases, emulsifying bases, non-toxic solvents or water-soluble bases.
  • Particularly suitable examples include lanolin, hard paraffin, liquid paraffin, soft yellow paraffin or soft white paraffin, white beeswax, yellow beeswax, cetostearyl alcohol, cetyl alcohol, dimethicones, emulsifying waxes, isopropyl myristate, microcrystalline wax, oleyl alcohol and stearyl alcohol.
  • the pharmaceutically acceptable carrier or vehicle is a gel, suitably a nonionic polyoxyethylene-polyoxypropylene copolymer gel, for example, a Pluronic gel, preferably Pluronic F-127 (BASF Corp.).
  • a Pluronic gel preferably Pluronic F-127 (BASF Corp.).
  • This gel is particularly preferred as it is a liquid at low temperatures but rapidly sets at physiological temperatures, which confines the release of the ODN component to the site of application or immediately adjacent that site.
  • the formulation may comprise Pluronic F-127 in gel or liquid form.
  • the pharmaceutical carrier may be selected from isotonic saline, phosphate buffered saline, a cationic agent, or lipofectant.
  • An auxiliary agent such as casein, gelatin, albumin, glue, sodium alginate, carboxymethylcellulose, methylcellulose, hydroxyethylcellulose or polyvinyl alcohol may also be included in the formulation of the invention.
  • the pharmaceutical composition may be formulated to provide sustained release of the antisense polynucleotide.
  • the formulation further includes a surfactant to assist with oligodeoxynucleotide cell penetration or the formulation may contain any suitable loading agent.
  • a surfactant to assist with oligodeoxynucleotide cell penetration
  • the formulation may contain any suitable loading agent. Any suitable non-toxic surfactant may be included, such as DMSO. Alternatively a transdermal penetration agent such as urea may be included.
  • the invention provides a method of site-specific downregulation of connexin protein expression for a therapeutic and/or cosmetic purpose which comprises administering a formulation as defined above to a site on or within a patient at which said downregulation is required.
  • the formulation is administered in a sufficient amount to downregulate expression of said connexin protein(s) for at least 24 hours post-administration.
  • the polynucleotide may be administered by continuous delivery for 24 hours or longer.
  • the polynucleotide may be administered at a dose of from 0.1 to 100 mg/kg body weight or 1 to 40 mg/kg body weight.
  • the invention provides a formulation for use in the treatment of a human for a wound or for inflammation which formulation comprises an antisense polynucleotide to a connexin 43 together with a pharmaceutically acceptable carrier or vehicle.
  • said wound is a burn.
  • said wound is the result of physical trauma to tissue, including neuronal tissue such as the brain, spinal cord or optic nerve.
  • the formulation is provided for use in a method of promoting wound healing, treating inflammation or decreasing scar formation.
  • the invention also provides the use of a formulation as defined in any one of the preceding claims in the manufacture of a medicament for promoting wound healing, treating inflammation, or decreasing scar formation.
  • the wound may be the result of trauma or surgery, with the formulation being applied to the wound immediately prior to surgical repair and/or closure thereof.
  • the formulation is a cream or gel.
  • Figures 1 to 5 show sections of rat brain lesions treated with Pluronic gel containing antisense oligodeoxynucleotides specific to connexin 43, or for control lesions, Pluronic gel alone. In all cases lesions were sectioned serially in a coronal plane and the mid point sections used for analysis. Each image (except Figure 5 ) shows 4 mm by 5.33 mm of tissue. Figure 5 is approximately 1.2 mm by 2 mm.
  • the focus of the invention is on site-specific downregulation of connexin expression. This will have the effect of reducing direct cell-cell communication at the site at which connexin expression is downregulated, which gives rise to numerous therapeutic/cosmetic applications as described below.
  • the downregulation of connexin expression is based generally upon the anti-sense approach using antisense polynucleotides (such as DNA or RNA polynucleotides), and more particularly upon the use of antisense oligodeoxynucleotides (ODN).
  • antisense polynucleotides such as DNA or RNA polynucleotides
  • ODN antisense oligodeoxynucleotides
  • these polynucleotides eg. ODN
  • the polynucleotides are single stranded, but may be double stranded.
  • the antisense polynucleotide may inhibit transcription and/or translation of the connexin.
  • the polynucleotide is a specific inhibitor of transcription and/or translation from the connexin gene, and does not inhibit transcription and/or translation from other genes.
  • the product may bind to the connexin gene or mRNA either (i) 5' to the coding sequence, and/or (ii) to the coding sequence, and/or (iii) 3' to the coding sequence.
  • the antisense polynucleotide will cause the expression of connexin mRNA and/or protein in a cell to be reduced.
  • the antisense polynucleotide is generally antisense to the connexin mRNA.
  • a polynucleotide may be capable of hybridising to the connexin mRNA and may thus inhibit the expression of connexin by interfering with one or more aspects of connexin mRNA metabolism including transcription, mRNA processing, mRNA transport from the nucleus, translation or mRNA degradation.
  • the antisense polynucleotide typically hybridises to the connexin mRNA to form a duplex which can cause direct inhibition of translation and/or destabilisaiion of the mRNA. Such a duplex may be susceptible to degradation by nucleases.
  • the antisense polynucleotide may hybridize to all or part of the connexin mRNA. Typically the antisense polynucleotide hybridizes to the ribosome binding region or the coding region of the connexin mRNA.
  • the polynucleotide may be complementary to all of or a region of the connexin mRNA.
  • the polynucleotide may be the exact complement of all or a part of connexin mRNA.
  • absolute complementarity is not required and polynucleotides which have sufficient complementarity to form a duplex having a melting temperature of greater than 20°C, 30°C or 40°C under physiological conditions are particularly suitable for use in the present invention.
  • polynucleotide is typically a homologue of the mRNA.
  • the polynucleotide may be a polynucleotide which hybridises to the connexin mRNA under conditions of medium to high stringency such as 0.03M sodium chloride and 0.03M sodium citrate at from about 50 to about 60 degrees centigrade.
  • the polynucleotide will typically be from 6 to 40 nucleotides in length. Preferably it will be from 12 to 20 nucleotides in length.
  • the polynucleotides may be at least 40, for example at least 60 or at least 80, nucleotides in length and up to 100, 200, 300, 400, 500, 1000, 2000 or 3000 or more nucleotides in length.
  • the connexin protein or proteins targeted by the ODN will be dependent upon the site at which downregulation is to be effected. This reflects the non-uniform make-up of gap junction(s) at different sites throughout the body in terms of connexin sub-unit composition.
  • the connexin may be any connexin that naturally occurs in a human or animal.
  • the connexin gene (including coding sequence) generally has homologue with any of the specific connexins mentioned herein, such as homology with the connexin 43 coding sequence shown in Table 1.
  • the connexin is typically an ⁇ or ⁇ connexin.
  • the connexin is expressed in the skin or nervous tissue (including brain cells).
  • connexin proteins are however more ubiquitous than others in terms of distribution in tissue.
  • One of the most widespread is connexin 43.
  • ODNs targeted to connexin 43 are used in the present invention.
  • ODNs targeted at separate connexin proteins be used in combination (for example 1, 2, 3, 4 or more different connexins may be targeted).
  • ODNs targeted to connexin 43, and one or more other members of the connexin family can be used in combination.
  • Individual antisense polynucleotides may be specific to a particular connexin, or may target 1, 2, 3 or more different connexins. Specific polynucleotides will generally target sequences in the connexin gene or mRNA which are not conserved between connexins, whereas non-specific polynucleotides will target conserved sequences.
  • the ODNs for use in the invention will generally be unmodified phosphodiester oligomers. They will vary in length but with a 30 mer ODN being particularly suitable.
  • the antisense polynucleotides may be chemically modified. This may enhance their resistance to nucleases and may enhance their ability to enter cells.
  • phosphorothioate oligonucleotides may be used.
  • Other deoxynucleotide analogs include methylphosphonates, phosphoramidates, phosphorodithioates,
  • MBOs Mixed backbone oligonucleotides
  • MBOs contain segments of phosphothioate oligodeoxynucleotides and appropriately placed segments of modified oligodeoxy- or oligoribonucleotides.
  • MBOs have segments of phosphorothioate linkages and other segments of other modified oligonucleotides, such as methylphosphonate, which is non-ionic, and very resistant to nucleases or 2'-O-alkyloligoribonucleotides.
  • the precise sequence of the antisense polynucleotide used in the invention will depend upon the target connexin protein.
  • the applicant's have found ODNs having the following sequences to be particularly suitable:
  • ODNs directed to other connexin proteins can be selected in terms of their nucleotide sequence by any convenient, and conventional, approach.
  • the computer programmes MacVector and OligoTech from Oligos etc. Eugene, Oregon, USA
  • ODNs for connexins 26, 31.1 and 32 have the following sequences:
  • the ODNs can be synthesised using a DNA synthesiser.
  • the ODN(s) require site-specific delivery. They also require delivery over an extended period of time. While clearly the delivery period will be dependent upon both the site at which the downregulation is to be induced and the therapeutic effect which is desired, continuous delivery for 24 hours or longer will often be required.
  • this is achieved by inclusion of the ODN(s) in a formulation together with a pharmaceutically acceptable carrier or vehicle, particularly in the form of a formulation for topical administration.
  • the formulations for use according to the invention have utility in any therapeutic/cosmetic approach where a transient and site-specific interruption in cell-cell communication is desirable. These include in treating neuronal damage in the brain, spinal cord or optic nerve (where the damage is to be localised as much as possible), in the promotion of wound healing and in reducing scar formation following, for example, cosmetic surgery or bums.
  • topical formulations such as creams can be employed to regulate epithelial basal cell division and growth (using ODNs targeted to connexin 43) and outer layer keratinisation (using ODNs targeted to connexin 31.1).
  • the antisense polynucleotides may be present in a substantially isolated form. It will be understood that the product may be mixed with carriers or diluents which will not interfere with the intended purpose of the product and still be regarded as substantially isolated. A product of the invention may also be in a substantially purified form, in which case it will generally comprise 90%, e.g. at least 95%, 98% or 99% of the polynucleotide or dry mass of the preparation.
  • the antisense polynucleotides (including ODNs) for use according to the invention may thus be administered to a human or animal in need of treatment, such as a human or animal with any of the diseases or conditions mentioned herein.
  • the condition of the human or animal can thus be improved.
  • the polynucleotide and formulation may thus be used in the treatment of the human or animal body by therapy. They may be used in the manufacture of a medicament to treat any of the conditions mentioned herein.
  • the antisense polynucleotides may be administered by typically (at the site to be treated). Preferably the antisense polynucleotides are combined with a pharmaceutically acceptable carrier or diluent to produce a pharmaceutical composition. Suitable carriers and diluents include isotonic saline solutions, for example phosphate-buffered saline.
  • the composition may be formulated for parenteral, intramuscular, intracerebral, intravenous, subcutaneous, or transdermal administration.
  • the dose at which an antisense polynucleotide is administered to a patient will depend upon a variety of factors such as the age, weight and general condition of the patient, the condition that is being treated, and the particular antisense polynucleotide that is being administered.
  • a suitable dose may however be from 0.1 to 100 mg/kg body weight such as 1 to 40 mg/kg body weight.
  • Uptake of nucleic acids by mammalian cells is enhanced by several known transfection techniques for example those including the use of transfection agents.
  • the formulation which is administered may contain such agent.
  • agent include cationic agents (for example calcium phosphate and DEAE-dextran) and lipofectants (for example lipofectam TM and transfectam TM ).
  • polynucleotides may be a homologue of sequence in connexin mRNA.
  • Such polynucleotides typically have at least 70% homology, preferably at least 80, 90%, 95%, 97% or 99% homology with the relevant sequence, for example over a region of at least 15, 20, 40, 100 more contiguous nucleotides (of the homologous sequence).
  • Homology may be calculated based on any method in the art.
  • the UWGCG Package provides the BESTFIT program which can be used to calculate homology (for example used on its default settings) ( Devereux et al (1984) Nucleic Acids Research 12, p387-395 ).
  • the PILEUP and BLAST algorithms can be used to calculate homology or line up sequences (typically on their default settings), for example as described in Altschul S. F. (1993) J Mol Evol 36:290-300 ; Altschul, S, F et al (1990) J Mol Biol 215:403-10 .
  • HSPs high scoring sequence pair
  • Extensions for the word hits in each direction are halted when: the cumulative alignment score falls off by the quantity X from its maximum achieved value; the cumulative score goes to zero or below, due to the accumulation of one or more negative-scoring residue alignments; or the end of either sequence is reached.
  • the BLAST algorithm parameters W, T and X determine the sensitivity and speed of the alignment.
  • the BLAST algorithm performs a statistical analysis of the similarity between two sequences; see e.g., Karlin and Altschul (1993) Proc. Natl. Acad Sci. USA 90: 5873-5787 .
  • One measure of similarity provided by the BLAST algorithm is the smallest sum probability (P(N)), which provides an indication of the probability by which a match between two nucleotide or amino acid sequences would occur by chance.
  • P(N) the smallest sum probability
  • a sequence is considered similar to another sequence if the smallest sum probability in comparison of the first sequence to the second sequence is less than about 1, preferably less than about 0.1, more preferably less than about 0.01, and most preferably less than about 0.001.
  • the homologous sequence typically differs from the relevant sequence by at least (or by no more than) 2, 5, 10,15, 20 more mutations (which may be substitutions, deletions or insertions). These mutations may be measured across any of the regions mentioned above in relation to calculating homology.
  • the homologous sequence typically hybridises selectively to the original sequence at a level significantly above background.
  • Selective hybridisation is typically achieved using conditions of medium to high stringency (for example 0.03M sodium chloride and 0.03M sodium citrate at from about 50°C to about 60°C).
  • medium to high stringency for example 0.03M sodium chloride and 0.03M sodium citrate at from about 50°C to about 60°C.
  • suitable conditions include 0.2 x SSC at 60°C. If lower stringency is required, suitable conditions include 2 x SSC at 60°C.
  • Pluronic gel is liquid at low temperatures, 0-4°C, but sets when dropped onto the embryo at physiological temperature, remaining in place for at least 12 hours.
  • the gel has the additional advantage of being a mild surfactant and this, used either alone or in conjunction with DMSO, appeared to markedly expedite ODN penetration into cells (Wagner, 1994).
  • Table 1 The Effect on Limb Development of ODN Application Between Stages 8 & 14 of Chick Embryo Development Antisense oligodeoxynucleotides to Connexin 43 DB1 GTA ATT GCG GCA GGA GGA ATT GTT TCT GTC CG1 GGC AAG AGA CAC CAA AGA CAC TAC CAG CAT Control oligodeoxynucleotides DB 1 (sense) GAC AGA AAC AAT TCC TCC TGC CGC AAT TAC DB 1 (chick) GTA GTT ACG ACA GGA GGA ATT GTT CTC GTC CV3(random) TCG AAC TGT CAA GAC TGC TAT GGC GAT CAT Gel only
  • ODN gel mixtures were prepared from concentrated stock solutions stored at -80°C.
  • DB1 is a mouse anti-sense sequence, complementary to bases 1094 - 1123 of the a1 connexin gene. It has four mismatches with chick a1 connexin sequence. CG1 is complementary to chick a1 connexin bases 720-749. Efficacy of this probe was improved with 1% Dimethylsulphoxide (DMSO) added to the gel. DMSO had no added effect on other anti-sense ODN or control results.
  • DMSO Dimethylsulphoxide
  • Immunohistochemical localisation of a1 connexin gap junction protein at cell-cell interfaces provides a direct measurement of the anti-sense effect.
  • Antipeptide a1 connexine specific antibody probes were used to stain wholemount embryos and the connexin distribution was analysed using confocal laser scanning microscopy according to established procedures (Green et al., 1995). Control labelling for two other connexins expressed in the developing chick embryo (connexins by & b2) was similarly carried out, also using sequence specific antibodies (Becker et al., 1995).
  • Pluronic F-127 gel to deliver unmodified a1 connexin specific anti-sense ODN's to the developing chick embryo, protein expression can be interfered with at chosen time points and allows the anti-sense treatment to be targeted to specific regions of a chick embryos.
  • a droplet of gel containing the anti-sense at a relatively low concentration was placed precisely onto individual embryos. The gel sets and remains in place for at least 12 hours and thus a sustained low dose of anti-sense is maintained in this region.
  • the anti-sense applications were targeted and timed to block junction formation prior to the periods of elevated expression in the limb, neural tube and face.
  • Astrocytes constitute the most abundant cell type in the mammalian brain. They are extensively coupled to one another and to neurons through gap junctions composed predominantly of connexin 43 (Giaume and McCarthy (1996)). Following ischaemia induced or physical brain damage these channels remain open and a spreading wave of depression (initiated by raised interstitial potassium and glutamate and apoptotic signals) is propagated (Cotrina et al., (1998); Lin et al (1998)). Waves of increased cytosolic calcium and second messenger molecules such as IP3 are slowly spread via the gap junction channels to neurons beyond the core of the damaged region, resulting in lesion spread in the 24-48 hours following the insult. In this manner, undamaged neighbouring cells are destroyed (Lin et al., 1998), the so-called bystander effect.
  • Oligodeoxynucleotides were prepared with the following sequences:
  • Unmodified ODN's were delivered in Pluronic F-127 gel (BASF) in phosphate buffered saline (PBS). Pluronic gel is liquid at low temperatures (0-4°C) and sets at physiological temperatures, and is also a mild surfactant. Unmodified ODN's normally have a half life of approximately 20 min in cells (Wagner, 1994) but the Pluronic gel loading method provides a continual diffusion source, the gel acting as a reservoir Becker et al., (1999)). ODN's specific to connexin 43 were applied, or control random ODN's of similar base composition, at 2mM final concentration. Gel only controls were also carried out. ODN's were 30 mers analysed to show that no hairpin looping or homodimerisation should occur.
  • BASF Pluronic F-127 gel
  • PBS phosphate buffered saline
  • Brain lesions were carried out on 250-300 g male Wistar rats. Animals were anaesthetised with 1-2% halothane in oxygen and the head held in a steriotaxic clamp. The region around the lesion site was shaved and the skin over the skull slit in a civilital plane with a scalpel and pulled back to leave the skull plates clear. A 0.5 mm diameter hole was drilled through the skull plate 3 mm to the right of bregma using an Arlec engraver and a lesion made into the cortex of the brain using a 19G 11 ⁇ 2 gauge syringe needle attached to a micrometer stage. The stage allowed accurate directional control and a precise 2 mm penetration depth which kept the lesion within the cortex and well above the corpus callosum.
  • the needle with the gel plug at its tip was transferred to a 1 ml syringe containing PBS and a sleeve slipped over the needle shaft so that the needle tip could be lowered into the lesion with the sleeve (coming up against the skull) preventing overpenetration.
  • gentle pressure on the syringe plunger "popped" the gel plug out of the needle into the lesion.
  • the wound was then treated with hydrogen peroxide to stop bleeding and the skin sutured back into place. Animals were carefully monitored and left until ready for sacrifice 24 hours, 48 hours or 12 days later.
  • haemotoxylin and eosin staining sections were hydrated through a descending series of alcohols (absolute, 2 x 95%, 1 x 70% and water) and stained in Gill's haemotoxylin for 4 minutes. The sections were then washed in water, dipped in Scott's water and rewashed in water. They were then stained for 30 seconds in Moore's buffered eosin. The sections were washed once more in water before dehydration through a series of alcohols (2 x 95%, 1 x absolute), 50:50 alcohol:xylol and dipped in xylene. The sections were then mounted using Histomountä mounting medium.
  • Nissl staining sections were dehydrated in an ascending graded series of alochols (75%, 95%, 3 x 100%), five minutes in each, and defatted in xylene for five minutes. The sections were then rehydrated by descending through the same series of alcohols and washed in water. The sections were then placed in a Nissl staining solution (5 ml of a 2% aqueous Cresyl violet stock solution, 90 ml of a 6% glacial acetic acid in water solution, 10 ml of a 1.35% sodium acetate solution) for 10 minutes. The sections were then quickly dehydrated in a series of ascending alcohols for 5 minutes at 75%, then 2 minutes each at 95% and 3 x 100%, three charges of xylene for 10 minutes each. They were then coverslipped with Histomountä mounting medium.
  • Frozen sections were first allowed to come back up to room temperature in PBS. They were then permeabilised in methanol for two minutes, rinsed in PBS and transferred to a solution of 0.1M lysine and 0.1% Triton-X 100 in PBS for blocking over 30 min. Two washes in PBS, each of two minutes, followed. PBS was removed and 50 ml per section of primary antibody was applied.
  • Immunohistochemistry was carried out with primary antibodies against connexin 43, Neuronal-Nuclei (vertebrate specific nuclear protein NeuN) and GFAP (glial fabrillary acidic protein). The following antibodies were used:
  • a coverslip was lowered onto the sections and sealed with nail varnish.
  • the secondary antibody was a biotinylated Goat anti-mouse followed by an avidin linked HRP and DAB reaction (Sigma ExtrAvidin or DAKO Quickstain kit).
  • Immunofluorescent labelling was carried out using a Leica TCS 4D confocal laser scanning microscope. Double labelled images were subsequently combined using the Leica Combine function or in Adobe Photoshop. Haemotoxylin and eosin, and Nissl stained samples or Neuronal-N labelled sections were captured using a Kontron (Zeiss) Progress 3008 digital camera and lesion areas analysed using MetaMorph (Universal Imaging Corp). Lesion areas were analysed for the middle section of each lesion.
  • GFAP glial fibrillary acidic protein
  • connexin 43 protein levels are clearly reduced at many places along the edge of antisense treated lesions, particularly the basal and medial edges ( Figure 6 ) compared with controls ( Figure 7 ).
  • the only connexin 43 labelling remaining 24 hours after connexin 43 specific antisense treatment is in blood vessel walls despite raised GFAP levels ( Figure 6 ).
  • connexin 43 labelling around antisense treated lesion collocalises to a much lesser extent with GFAP labelling than in controls in which over half of the connexin 43 labelling is astrocyte related.
  • Other connexin levels did not appear to be altered by the connexin 43 specific antisense treatments.
  • DB1 is anti connexin 43 treated HB3 is random oligo and appears to be toxic Entire Lesion: (measurements in square mm) 24 hours 48 hours 12 days DB1 2.42; 3.16; 3.78; 5.57 3.7; 6.05; 2.91; 3.41; 4.53 2.79; 2.86 HB3 7.14 13.19 Gel/empty 5.04; 4.48 3.96; 3.41; 3.56; 5.91 2.58; 3.3 Lesions from 1 mm down: (this is considered a more accurate measure as all lesions tend to spread at the outer lip indicating that the treatment gel has settled in the bottom of the lesion and/or the outer cortex has been damaged when drilling the skull or inserting the gel loading needle).
  • the Pluronic gel plug - antisense ODN method has been used to study the effect of connexin 43 knockdown during astrocytosis which occurs following lesioning of the cerebral cortex of the mammalian brain.
  • release of toxins from dying neurons causes what is known as the bystander effect, with the toxins spreading to neighbouring cells through gap junction channels (Lin et al, (1998)).
  • slow release of toxins apparently leads to an upregulation of connexin 43 channels in astrocytes to enable the transport and removal of the toxins to the blood stream. In cases of severe trauma however, this upregulation aids the spread of high toxin levels to neighbouring neurons, killing them.
  • Blocking of the connexin 43 upregulation and knockdown of connexin 43 channels prevents this spread leading to lesions up to 50% smaller in cross sectional area. This has significant implications in the management of ischeamic stroke, treatment of neurodegenerative diseases, and modulation of side effects from surgical intervention.
  • Another tissue of similar composition to the brain is the spinal cord in which the neural population is supported by populations of glial cells, including astrocytes which are responsible for the neuroprotective effect by removing glutamate and excess calcium from the neural environment.
  • This experiment investigates the ability of the formulations of the invention to reduce the spread of spinal cord lesions.
  • Oligodeoxynucleotides were prepared with the following sequences:
  • Wistar rats were anaesthetised and their spinal cord exposed. A standard hemisection lesion was then made in the cord and 5 ml of chilled Pluronic gel, containing either antisense or sense ODN's to connexin 43 (5mM) was placed in the lesion. Applications were made blind. The exposed cord was then recovered and the rat returned to its cage. Some animals were sacrificed at 24 hours whereas others were maintained for 12 days and two months in order to determine the extent of neuronal regeneration and the final size of the lesion. For axonal regeneration studies the rats were anaesthetised and their axons severed prior to their entry site to the spinal cord.
  • HRP Horse radish peroxidase
  • the antisense oligodeoxynucleotide knockdown of connexin 43 significantly reduces the lesion spread which occurs in the first 24-48 hours after spinal cord injury.
  • the knockdown of connexin 43 also reduces inflammation, further aiding in the neuroprotective effect, but there was no change in the ability for neurons to grow back across the lesion site.
  • antisense treatment with connexin 43 specific oligodeoxynucleotides cannot aid regrowth of damaged neurons, but has a significant neuroprotective effect reducing the spread of the insult.
  • fibroblasts To repair skin wounds a number of cell types, such as fibroblasts, endothelial cells and keratinocytes are activated to proliferate, migrate and lay down extracellular matrix to fill the wound.
  • Oligodeoxynucleotides were prepared with the following sequences:
  • Neonatal mice, CD1 strain were anaesthetised with local anaesthetic by spray.
  • 5 ml of chilled Pluronic gel, containing either Sense or Antisense ODN's was then applied to the wounds.
  • the Pluronic gel is liquid between 0-4°C but sets at higher temperature.
  • the gel sets in place and acts as a slow release reservoir for the ODN's as well as a mild surfactant, aiding the penetration of ODN's into the tissue.
  • Application of Sense ODN's was made to one paw and Antisense to the other, alternating left and right between litters. Pups were warmed under a lamp and then returned to their mother. Wounds were examined daily and scored for quality of healing. Representative pups were selected at 1 day, 5 day and 8 day post operation and their forelimbs photographed before the pups were anaesthetised and perfused with 2% paraformaldehyde. The forelimbs were removed and immersion-fixed in 2% paraformaldehyde overnight and then processed for resin (1 day) or wax (2 days onward) histology.
  • Inflammation of the wound was assessed 24 hours after wounding. Resin sections through the wound are stained with Toluidine blue to reveal nissl positive cells, neutrophils, which are the first cells to respond to injury. These can also be revealed using neutrophil specific markers.
  • Granulation is a feature of healing connective tissue and is cased by the invasion of numerous capillaries. Macrophages are known to express potent angiogenic factors such as VEGF. The degree of vascularisation is monitored with antibodies to VEGF receptors, anti-PCAM and anti-flt-1 which are both good blood vessel markers. Contraction of this tissue is brought about by the differentiation of wound fibroblasts into a contractile myofibroblast. After they have pulled the wound together they die apoptotically and are removed by macrophages. These cells can be revealed by smooth muscle actin specific antibodies and their formation and removal followed.
  • Scarring is normally assessed weeks or months after closure of the wound. However, a reasonable assessment can be made 12 days after wounding. Sections through the wounds are stained with the collagen stain Picrosirus Red and examined on a confocal microscope to determine the collagen density and orientation at the wound site.
  • Sense treated wounds looked no different from untreated with a normal spectrum of healing grades and rates ( Figure 10 ).
  • Antisense treated limbs were markedly different from the controls, they appeared to be less inflamed and the healing rate was generally faster.
  • connexin 43 antisense ODN's to a wound has a marked affect on the healing process.
  • the first noticeable effect is a reduction in the inflammation of the wounds which is noticeable in sections which show a much lower inflammatory response in terms of levels of neutrophils.
  • antisense treated wounds heal faster and with less scarring than control lesions.
  • the antisense ODN's can reduce connexin expression in 4-8 hours so they will not have an effect on the initial signalling of wounding but play a role in the secondary signalling events. It is interesting to note that neutrophils which invade in response to the wounding normally express large amounts of connexin 43. It is also possible that they form gap junctions with other cells in the wound and communicate with them. Reduction in this form of communication may result in a reduction of secreted factors from the neutrophils and may reduce cell death in the wound as well as granulation and hyperinnervation.
  • connexin protein levels (connexins 26, 31.1 and 43) are reduced in both the epithelial and subdermal layers of wounds starting within 6 hours, and remaining lowered for up to 6 days.
  • the antisense approach may speed up this initial protein reduction by blocking translational processes as protein removal from the membrane is occurring.
  • connexin 43 knockdown immediately following wounding has marked effects on reducing inflammatory levels and increasing healing rates.
  • Oligodeoxynucleotides were prepared with the following sequences:
  • Reproducible bums are delivered to moistened skin, and Pluronic gel containing antisense ODN's injected subdermal to the burn.
  • Pluronic gel containing antisense ODN's injected subdermal to the burn.
  • a series of burns were made using a soldering iron to the left and right sides of the skull of six newborn mice.
  • the bums on one side of the head were treated with connexin 43-specific ODN in Pluronic gel and those on the other side with sense control ODN in Pluronic gel.
  • formulations by which cell-cell communication can be downregulated in a transient and site-specific manner have application in methods of therapy and in cosmetic treatments.
  • the delivery of the ODN component of the formulation for an extended period (24 hours or longer) is a particular advantage in treating neuronal damage. This is because, in most instances of direct physical neuronal insult, neuronal cell loss extends well beyond the site of actual injury to the surrounding cells. This secondary neuronal cell loss occurs within 24 hours of the original injury and is mediated by junction gap cell-cell communication. Downregulation of connexin protein expression therefore blocks or at least downregulates communication between the cells and minimises secondary neuronal cell damage.
  • the formulations of the invention have been found effective in both promoting the wound healing process, reducing inflammation and in minimising scar formation.
  • the formulations therefore have clear benefit in the treatment of wounds, whether the result of external trauma (including burns) or surgical intervention.

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